Chuck



Patented Feb. 15, 1927.

THOMAS J. FEGLEY, or PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO NORTH BROS MFG. 00., OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYIr- VANIA.

CHUCK.

Application filed November 25, 1925. Serial No. 71,444.

The object of my invention is to provide means for retaining the spring member in the body of a chuck, when the chuck is being assembled and when the parts are removed for cleansing or repairs, or for inspection.

. Heretofore, the spring was loose, and as soon as the chuck was taken apart, the spring would be separated from the chuck and often times lost, or bent in assembling. In the accompanying drawing:

Fig. 1 is a sectional view on the line 11, Fig. 2, illustrating my improved spring-retaining means for chucks;

Fig. 2 is a section on the line.2-2, Fig. 1;

Fig. 3 is a diagrammatic view showing the spring with the retaining means entering the body of the chuck; I

Fig. 4 is a detailed perspective view showing the position of the retaining ring on the spring, when the spring is placed in position; and

Fig. 5 is a view showing the retaining ring at right angles to the planeof the spring.

1 is the body of a chuck, having a threaded periphery, and slotted at one end for the reception of the jaws 3. 2 is a spindle of a drill or other tool which is secured to the body 1 of the chuck by a pin 4, or other fastening means. 7

The slot 5 in one end of the body portion is reduced in diameter to form shoulders 6-6 for the tapered rear inner ends of the jaws 33. The reduced portion of the slot 5 is of sufficient width to allow for the reception of the U-shaped spring 7, which is made as clearly shown in Fig. 4, having hooked ends 8 which extend under bars 9 at the back of the jaws 3.

The spring. has shoulders 10 which fit against the upper wallof the slot, and an extension 11, which passes through the slot and into a cavity 12 in the body of the chuck between the end of the spindle 2 and a beveled base 13.

14 is the casing of the chuck, having an inner section 15 engaging the external threads on the body portion, and at the opposite end of thecasing is an inturned flange 16, in which is fitted a ring 17, forming the one raceway of a ball-bearing 18.

The other "raceway is formed in the block 19, which has an opening, the tapered walls of this opening fitting the tapered portion 20 of the jaws A'ring'21 retains this block in position.

In orderv to prevent the removal 01 the spring 7 after'it is once placed in position in the body of a chuck, a flat ring 22 is threaded on the spring, as clearly shown-in 1 Figs. 4 and 5, andiin order to allow this ring to pass into the cavity 12, the ring is arranged with its fiat'side as near as possible on a plane with the spring, as shown in f Figs. 3 and 4.

\Vhen the sprlng with its ring in position is passed throughthe opening formed by the narrow slot in the body portion, the ring is then free to turn, so that it can arrange itself at an angle in respect to the plane of the spring, as clearly shown inFigs. 2 and 5, in order that, when the chuck is dismembered, the spring will remain in the body of the chuck, but will be free to move laterally in the body, but cannot be removed therey from.

This arrangement-is a great convenience 1n assembllng the parts at the factory, and also prevents the loss of the spring when the chuck is dismembered for repairs or cleansing, or for inspection. 7 j I This arrangement prevents the destruction or bending of the spring when it is assembled after inspection, as the spring is attached to the body. Therefore the jaws must be attached to the spring before the shell can be applied.

I claim: 2 s

The combination with the body portion of a chuck having a slot and a cavitybeyond the slot, said slot having a narrow portion forming communication Iwith the cavity, jaws 1n the slot; a U-shaped spring havlng a portion extending into the slot of the body ortion and en 'a 'in the 'aws' a casin -for b D b b actuating the jaws; and a ring mounted on the spring within the cavity, said ring being passed through the slot in the body portion and into the cavity, said ring assuming an angle in respect to the spring, so as to prevent withdrawal of the spring after it is in positionin the body portion.

THOMAS J. FEGLEY. 

